77987348656 has 30 divisors (see below), whose sum is σ = 175769957220. Its totient is φ = 33423149088.

The previous prime is 77987348629. The next prime is 77987348701. The reversal of 77987348656 is 65684378977.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49736046 + ... + 49737613.

It is an arithmetic number, because the mean of its divisors is an integer number (5858998574).

Almost surely, 2^77987348656 is an apocalyptic number.

It is an amenable number.

77987348656 is an abundant number, since it is smaller than the sum of its proper divisors (97782608564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77987348656 is a wasteful number, since it uses less digits than its factorization.

77987348656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99473681 (or 99473668 counting only the distinct ones).

The product of its digits is 426746880, while the sum is 70.

The spelling of 77987348656 in words is "seventy-seven billion, nine hundred eighty-seven million, three hundred forty-eight thousand, six hundred fifty-six".